Fight week is in full swing in Las Vegas, and as Floyd Mayweather and Victor Ortiz make their entrances into a fan-packed MGM Grand, boxing experts Bert Sugar and Kieran Mulvaney break down the story lines playing out in the historically stacked welterweight division. Also, SI.com boxing reporter Chris Mannix brings the latest on-the-ground chatter from fighters and fans alike. Post your comments below, and your analysis might be featured in an upcoming post on InsideHBOBoxing.